Fixing a typo; NFC.

llvm-svn: 337719
diff --git a/llvm/tools/llvm-cxxdump/Error.cpp b/llvm/tools/llvm-cxxdump/Error.cpp
index d59547e..54207fa 100644
--- a/llvm/tools/llvm-cxxdump/Error.cpp
+++ b/llvm/tools/llvm-cxxdump/Error.cpp
@@ -1,4 +1,4 @@
-//===- Error.cxx - system_error extensions for llvm-cxxdump -----*- C++ -*-===//
+//===- Error.cpp - system_error extensions for llvm-cxxdump -----*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //